The LSG version was the most impressive, since it uses far less material and weight for the cooling system. Instead of using lots of aluminum for the heatsink, it uses a proprietary MEMS cooling system. The LSG blog confirms that that they plan to enter this new bulb for the DOE “L” Prize. http://blog.lsgc.com/2011/05/17/lsg-technologies-displayed-at-lightfair/